Robertshaw DSL-520P - Manual (Page 15)

THERMOSTAT INSTALLATION: DSL-520P
LOCATION
The most important consideration in installing your DSL-520P Communicating Zone thermo-
stat is where to locate the unit. The location can radically affect the operation of the thermo-
stat. To ensure proper operation, the thermostat should be mounted on an inside wall in a
frequently occupied area of the zone. In addition, its position must be at least 18 inches (46 cm)
from any outside wall, and approximately 5 feet (1.5 m) above the floor in a location with
freely circulating air of an average temperature.
BE SURE TO AVOID THE FOLLOWING LOCATIONS:
* behind doors or in corners where freely circulating air is unavailable
* where direct sunlight or radiant heat from appliances might affect control operation
* on an outside wall
* adjacent to, or in line with, conditioned air discharge grilles, stairwells, or outside doors
* where its operation may be affected by steam or water pipes or warm air stacks in an
adjacent partition space, or by an area not heated or cooled behind the thermostat
* where its operation will be affected by the supply air of an adjacent unit
* near sources of electrical interference such as arcing relay contacts
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THERMOSTAT VERIFICATION
The thermostat operation may be verified only when the SZP control module is powered; the
control module provides power to the zone thermostats. Verify operation as follows:
1. Check that the satellite dish symbol appears at the lower left corner of the display and that
the uplink symbol ✭ flashes occasionally. If the symbols are present, the thermostat and the
SZP control module are communicating properly. If the symbols are not present, the ther-
mostat and the module are not communicating. If ✫ is not present, check communication
wiring and ensure that polarity is correct.
2. Press the MODE button to select either the heat % or cool ☛ mode. The flame and snowflake
symbols start flashing only when SZP finally brings on the equipment.
3. Press the ✟ button to raise the temperature setpoint above (in heat mode), or the ✞ button to
lower the temperature setpoint below (in cool mode), the current displayed temperature.
Within a few seconds, the thermostat should call for either heating or cooling. Check at the
SZP control module that the orange LED (heating) or the yellow LED (cooling) for this
zone’s input is ON, indicating that the control module has acknowledged the call. Note that
the equipment might not be activated depending on the setup and status of the control mod-
ule.
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